<template>
  <!-- 输入框 -->
  <header class="header">
      <h1>小达记事本</h1>
      <input placeholder="请输入任务" class="new-todo" v-model="todoName"
        @keyup.enter='handleAdd'
      />
      <button class="add" @click="handleAdd">添加任务</button>
    </header>
</template>

<script>
export default {
  data() {
    return{
      todoName:''
    }
  },
  methods:{
    handleAdd () {
      // console.log(this.todoName)
      if(this.todoName.trim() === '') {
        alert('任务名称不能为空')
        return
      }
      this.$emit('add',this.todoName)
      this.todoName=''
    }
  }
}
</script>

<style>

</style>